Stadium: Court 6 Round: 27 Ground: Clay
| ITF Women Essen WD | 2018/06/13 17:00 | Ozgen/Papamichail v Kurata/Piai | 6-0,6-1 |
| ITF Women Essen WD | 2018/06/13 17:35 | Rakic/Anna Schubries v Koelzer/Rueffer | 0-6,1-6 |
| ITF Women Altenkirchen WD | 2018/02/20 17:15 | Andrei/Husaric v Koelzer/Rueffer | 6-7,6-2,5-10 |
| ITF Women Stuttgart WD | 2018/01/25 15:40 | Koelzer/Rueffer v Krejsova/Maleckova | 4-6,2-6 |
| ITF Women Stuttgart WD | 2018/01/24 15:30 | Maetschke/Urzhumova v Koelzer/Rueffer | 1-6,4-6 |
| ITF Women Hechingen WD | 2017/08/13 11:30 | Rosatello/Shapatava v Koelzer/Rueffer | 6-2,6-4 |
| ITF Women Hechingen WD | 2017/08/12 11:20 | Koelzer/Rueffer v Anshba/Silich | 6-2,6-1 |
| ITF Women Hechingen WD | 2017/08/11 15:16 | Koelzer/Rueffer v Anshba/Silich | 6-2,5-1 |
| ITF Women Hechingen WD | 2017/08/09 10:00 | Shinikova/Zarazua v Koelzer/Rueffer | 2-6,7-5,6-10 |